US Patent: 140,390
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| Improvement in Process of Hardening Edge Tools
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Patentee:
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| Leverett W. Stuart (exact or similar names) - Hawley, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 27, 1872 |
| Granted: |
Jul. 01, 1873 |
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Russ Allen.
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Description: |
| A previously hardened and tempered blade is further hardend by applying the edge under pressure against a revolving smooth faced metallic wheel. Application to edge tools, harvester cutters, and saw teeth. |
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